If f(x) = ln 4x, what is the value of f^-1(6). (The f raises to the -1 is the inverse function of f(x).

The answer is 100.86.

Printable View

- Sep 19th 2011, 06:29 PMbenny92000Inverse function
If f(x) = ln 4x, what is the value of f^-1(6). (The f raises to the -1 is the inverse function of f(x).

The answer is 100.86. - Sep 19th 2011, 06:38 PMAckbeetRe: Inverse function
So, let y = ln(4x). How, in general, do you invert functions?

- Sep 19th 2011, 07:09 PMPupilRe: Inverse function
The natural log (ln) has a base e, so another way of rewriting f(x) = ln 4x or y = ln 4x:

y = 6. Substituting it into this equation and solving for x will yield approximately 100.86.